Radio interference eliminator for electrical appliances



A ril 12, 1938. H. COLLINS 2,114,102

RADIO INTERFERENCE ELIMINATOR FOR ELECTRICAL APPLIANCES Filed Dec. 24, 1956 2 Sheets-Sheet l IIIIIIIIIIIIIIIIIIII////IW\ v la/1, V--

"I, I- p n fiarlyl. Collins ATTORNEY H. L. COLLINS Filed Dec. 24, 1936 2 Sheets-Sheet 2 RADIO INTERFERENCE ELIMINATOR FOR ELECTRICAL APPLIANCES April 12, 1938.

Patented Apr. 12,1938 2,114,102

UNITED STATES PATENT OFFICE RADIO INTERFERENCE EIJMINATOR Foil ELECTRICAL APPLIANCES Harry L. Collins, Dover, Ohio, assignor to The Hoover Company, North Canton, Ohio, a corporation of Ohio Z Application December 24, 1936, Serial No. 117,461 4 Claims. (Cl. 171-252) This application relates to application of radio through the handle as taken on line 6-6 of Figinterference eliminating condensers to portable ure 5, and

motor driven household'appliances and morepar- Figure '7 is a wiring diagram of the electrical ticularly to small suction cleaners for the purpose circuit of the motor showing the location of the 5 of eliminating, or at, least minimizing, the intercondenser therein. 5 ference to clear reception due to the operation of Referring fi s t the ppliance to be q pp \the motor in the vicinity of the radio-receiving with a radio interference eliminating condenser, set. t the same comprises a light portable suction Without'going into the electrical phenomena ascleaner 0f e typ that is held y the Operator suilice to lay 'that it is possible by means of a be cleaned and intended primarily for cleaning condenser in the motor circuit to eliminate the upholstered and fabric surfaces other than carcauses of radio interference. Nor is it necessary P and r A such. the n r mpr s to explain the nature of a condenser, except to a cylindric shaped casing I having a down-turned ratus that-bass definite capaglty for t- 3 removably attached at its opposite end. Within ing electrical charges, In him, t e present, m the casing I is a motor 4 driving a suction fan 5 vention does not pertain to the problem of radio mounted directly u the inward and of thfi interference eliminati nor t th design of a motor armature shaft. The motor 4 is of any uitabl d g t purpose but rather to standard type and design consisting of the usual 20 v the problem of incorporating theeondeneer m the arrangement of armature, field core and commugppuanca tator all enclosed within a' sheet metal frame or dm as t electrical epphehee of housing to. As a preferable arrangement the the present disclosure is a small portable suctitn mowr is supmrwd with"! the through time; having handle med to the body f the medium of rubber spacing blocks 6, so that th appliance, fu th r object f the preeeht the entire motor is insulated from the rest of the invention is to provide an arrangement for l w m t a eondeheerwithm thehehow up no Mounted on top of the cleaner casing is a U- non of the handle and as shhwh m'the aem shaped handle I preferably molded from a suitpawn drawings, m whteh able plastic substance, and having an upwardly 30 Figure l is a general view in side elevation of waning cavity med-therein and M portable metten eleaner with Demons stantially the length and depth of the longituhmken my to Show the general design of the dinal grip portion thereof, as clearly shown in cleaner and the mounting for a condenser within. Figure Entermg the cavity at the and! 5 th ha the handle is a conductor cord 0 for supplying m 3 1 an enlgrged top phm w of the current to thezmotor, this cord having suitable Me, with e portion of the cover plate broken anchorage in the rear end of the handle as is away to Show. the condenser mountthg customary in electrical appliances of this char- Flgure 3 is a detail view in side elevation of 40 the hendle and time pomon of the cleaner For the purpose of the present disclosure it is 40 mm. mm handle hem shown for the most not deemedn to identify each element part in vertical section as taken on line 3-3 of :5 mg mum as the same is compuflvely Figure 2, and a portion of the cleaner casing mph is understandble from the wiring diagram of Figure I, in which the various broken away to show the motor mounting. 4 is an e ed 1 can w Show mural the circizgit arereppesented by the usual 4.)

ing a modified handle construction and condenser Thus ream-tin I g to letters instead of numerals mo tns i p Phil view. with: portion 1' the to designate the electrical elements. of the circover plate broken away to show th interi of cult, the current supply line carried by the cord the handle. I leads first to a switch-B located at the forward 5o Figure 5 is a view in side elevation of the handle end of the handle cavity, and preferably supand adjacent portion of the cleaner casing, with ported by a cover plate I which seats over the portions thereof shown in vertical section as taken 7 top opening of the cavity and is held in place by oniineHoi'Figure4. meansof screwslmla. Thes'witch maybeof 1;) sociated with radio reception interference, it will in one hand as it is moved over the surface to m 7 l3 point'out that it is an electrical device or appanozzle P r i n 2 it t f rward end and a ir ag 15 6 is a detail view in cross section anystandard type suitableforthemrpolatne 5a one shown herein having a switch lever of the rocking snap type operated by the thumb to open or close circuit. .I'he switch S is located in one of the conductors leading to the motor (M on the wiring diagram) and across the line immediately beyond the switch is the interference eliminating condenser C which is grounded on the oi the motor.

The condenser C consists electrically of a group of positive and negative plates insulated from each other and forming a small compact unit of a flattened cylindric shape. denser is necessarily small in size and fits snugly within the handle cavity adjacent its rear end. Moreover the condenser is located just beneath the cover plate d being covered by a shield ill consisting of a thin sheet of insulating material bent into lJ-shape and inserted into the cavity with its open side downwardly, the shield being somewhat longer than the condenser so as to afford protection to the wires which lead into the condenser from each end. And finally, the condenser with its protecting shield 10 lies along the upper edge of the handle cavity thus leaving sumcient space below for the wiring leading inwardly through the rear end of the handle.

The arrangement shown in Figures 4, 5 and 6 is a modification of that shown in Figures 1 to 3 inclusive, the essential departure being in the formation of the handle and the location of the condenser. Thus the handle i2 is preferably molded of a suitable plastic substance and in two halves permanently joined together by means of double-ended drive screws 13. Otherwise the formation of the handle is substantially the same as before, having a cavity opening along the top edge of the handle and closed by a cover plate 14. The switch S and the various wires leading to and from the motor are located within the cavity asis also the condenser 0, although its location and method of mounting is somewhat difierent. Extending along the bottom of the cavity and substantially throughout one-half its length, is a relatively shallow recess it closed at its forward end by means of an upstanding transverse wall segment Hi. This recess 65 is sufficiently large to receive the condenser C which lies lengthwise therein with sufficient space at either end to accommodate the wires leading thereto. And finally, the condenser is preferably embedded in a mass of insulating material ll which is preferably introduced into the recess and around the condenser in molten form, becoming solid after it has cooled. Thus, except for the change in the location of the condenser within the handle cavity and the method of insulating it from the other current carrying elements,

the two arrangements herein disclosed are sub- The constantially the same and have the common attribute of compactly locating the condenser within the hollow handle of an electrical appliance.

Having therefore set forth alternative methods of accomplishing the advantageous features of the disclosure, ll claim:

1. In a motor driven electrical appliance of the character described, the combination cl 9. casing, a motor housed within said casing, a handle rigidly attached to the exterior of said casing and provided with an externally accessible cavity, a switch mounted in said cavity, a current supply line leading into said cavity to said switch and thence to saidmotor, a. condenser mounted in said cavity and electrically connected across said supply line and an insulator surrounding said condenser and holding it against displacement within said handle cavity.

2. in a motor driven electrical appliance of the character described, the combination of 2. casing, a motor housed within said casing, a handle rigidly mounted on said casing and provided with an externally accessible cavity, a switch carried by said handle and mounted in said cavity, elec trical conductors leading into said cavity from one end of said handle and to said motor through said switch, and a condenser electrically connected in circuit with said conductors and fitting within said handle cavity separated from the adjacent surfaces thereof by a shield of insulating material.

3. In a motor driven electrical appliance of the character described, the combination of a casing, a motor housed within said casing, a. handle rigidly attached to the exterior of said casing and provided with an externally accessible cavity, a switch carried by said handle and mounted in said cavity, electrical conductors leading into said cavity from one end of said handle, the current supplied by said conductors being controlled by said switch, and a condenser located within a recess at the bottom of said handle cavity and embedded in a mass of insulating material.

4. In a motor-driven electrical appliance of the character described, the combination of a casing, a motor mounted in said casing, a handle attached to said casing and provided with an externally accessible cavity, electrical conductors leading into said cavity and thence to said motor, a switch and a condenser located in said cavity and in circuit with said conductors, and means for insulating said condenser from said switch and electrical conductors within said cavity and for holding the same against displacement therein.

HARRY L. COLLINS. 

